class_docstr: Raw I/O implementation the input and output stream is resettable.
code: def readable(self):
      return self._size - self._input_offset
  
file_path: flink/flink-python/pyflink/fn_execution/ResettableIO.py
imports: import io
label_desc: Use image node_id 6 for calling the ResettableIO obj's underlying member method code with example usage: obj.readable() and returns: unknown